https://www.uscis.gov/news/uscis-approves-10000-u-visas-7th-straight-fiscal-year
For the 8th straight year, USCIS has approved the congressionally mandated annual limit of 10,000 petitions for U nonimmigrant status for victims of certain crimes who assist law enforcement authorities. USCIS will continue to review pending petitions for eligibility for potential visa issuance when more visas become available.
October 1, 2016 marked the first day of fiscal year 2017, the day Congress allocates its annual 10,000 visa slots for eligible victims of qualifying crimes.
A U Visa applicant can file the I-765 along with the U petition and any necessary waiver applications and fee waiver requests.